Composite films were produced by successive vapor-depositions of nylon-11 and porphyrin compounds, 5,10,15,20-tetraphenylporphyrin (H2TPP), 5,10,15,20-tetra(4-pyridyl)porphyrin (H2TPyP), and 5,10,15,20-tetraphenylporphyrinato zinc (ZnTPP). The composite films win characterized by X-ray diffraction, scanning electron microscopy, and visible spectroscopy. Nylon-11 was vapor-deposited on a glass plate to produce a thin film with thickness of circa. 1 mu m. The vapor-deposited nylon-11 showed a transformation of morphology by a heat-treatment at 120 degrees C. A particulate film of H2TPP with thickness of circa. 350 nm was formed on the nylon-11 film by the vapor-deposition. The H2TPP particles were dispersed into the interior of the nylon-11 film, when the structure of the nylon-11 film was transformed by a heat-treatment at 120 degrees C. H2TPyP also formed a particulate film on the nylon-11 film by the vapor-deposition, and the H2TPyP particles were dispersed into the interior of the nylon-11 film. The particle size of H2TPyP was smaller than that of H2TPP, because the affinity for the nylon-11 was relatively high. On the ether hand, ZnTPP was vapor-deposited on the nylon-11 film in a state of a monomolecular dispersion. The ZnTPP/nylon-11 film showed a sharp Soret band, which was the same as that shown in a solution. Even after the heat-treatment at 120 degrees C, ZnTPP molecules kept the state of the monomolecular dispersion in the nylon-11 film. Therefore, ZnTPP molecules were considered to strongly interact with the nylon-11 molecules.